Which of the following is NOT classified as a secondary cardiomyopathy?

Hypertrophic cardiomyopathy is classified as a primary or idiopathic cardiomyopathy, which means it arises from genetic factors intrinsic to the heart muscle itself rather than as a consequence of an underlying disease or condition. This condition often results from genetic mutations that lead to abnormal heart muscle growth and is most commonly inherited. The primary nature of hypertrophic cardiomyopathy distinguishes it from secondary cardiomyopathies, which are typically caused by external factors or diseases affecting the heart muscle.

In contrast, conditions like hemochromatosis, chemotherapy effects, and lupus are all considered secondary cardiomyopathies because they result from systemic diseases or conditions that impact cardiac function. Hemochromatosis leads to iron overload in the body, which can damage the heart muscle. Chemotherapy effects can cause cardiotoxicity, leading to cardiac dysfunction. Lupus, an autoimmune disease, may involve the heart muscle causing inflammation and fibrosis. Thus, these factors show how they directly influence the cardiac muscle, distinguishing them from the primary nature of hypertrophic cardiomyopathy.